EP1202790B1 - Channel flow filter - Google Patents

Channel flow filter Download PDF

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Publication number
EP1202790B1
EP1202790B1 EP00950670A EP00950670A EP1202790B1 EP 1202790 B1 EP1202790 B1 EP 1202790B1 EP 00950670 A EP00950670 A EP 00950670A EP 00950670 A EP00950670 A EP 00950670A EP 1202790 B1 EP1202790 B1 EP 1202790B1
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EP
European Patent Office
Prior art keywords
filter
web
filtration
layers
channels
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00950670A
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German (de)
English (en)
French (fr)
Other versions
EP1202790A1 (en
Inventor
Dan L. Fanselow
Roberto C. Moreno
Thanh H. Pham
Michele H. Kelley
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3M Innovative Properties Co
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3M Innovative Properties Co
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/0036—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions by adsorption or absorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0001—Making filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
    • B01D46/12—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces in multiple arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/102—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/104—Alumina
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/106—Silica or silicates
    • B01D2253/108—Zeolites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/25—Coated, impregnated or composite adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/30—Physical properties of adsorbents
    • B01D2253/34—Specific shapes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/708—Volatile organic compounds V.O.C.'s
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/90—Odorous compounds not provided for in groups B01D2257/00 - B01D2257/708
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0258—Other waste gases from painting equipments or paint drying installations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/414—Further details for adsorption processes and devices using different types of adsorbents
    • B01D2259/4141—Further details for adsorption processes and devices using different types of adsorbents within a single bed
    • B01D2259/4145—Further details for adsorption processes and devices using different types of adsorbents within a single bed arranged in series
    • B01D2259/4146—Contiguous multilayered adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/10—Multiple layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/05—Methods of making filter

Definitions

  • the present invention relates to multi-layer filtration media having a plurality of continuous, tortuous channels.
  • the present invention meets the ongoing need for improvements in filter efficiency and pressure drop by providing filtration media possessing high efficiency and low pressure drop.
  • the filtration medium of the present invention is defined in the appended claims. It includes a plurality of filtration layers at least some of which have a multi-dimensional channel pattern formed therein.
  • the channel pattern includes a plurality of continuous, non-straight or tortuous channels formed across the filtration layer and a multi-dimensional edge at each end of the plurality of channels.
  • the filtration medium may be configured as a stack of the filtration layers with the channel pattern and multi-dimensional edges forming a plurality of inlets open through a first face of the stack, a plurality of outlets open through a second face of the stack, and a corresponding plurality of disruptive fluid pathways passing from the inlets through the stack to the outlets.
  • Each channel of the plurality of channels may be formed as a smoothly undulating curve that is parallel to the other channels of the pattern.
  • the plurality of channels may be formed with a radiused cross-section producing the multi-dimensional edge as a smoothly undulating curve.
  • the channels may be formed as irregular, non-parallel curves.
  • the shape of a channel and the cross-sectional area of that channel may vary along its length.
  • the shape and cross-section of channels on a single layer of filtration media, or adjacent layers of media may also vary.
  • the channels may be formed by embossing, molding or other suitable methods.
  • the first and second faces of the filtration media may be opposite one another, adjacent one another, or may include a third face.
  • the faces may be parallel or non-parallel as needed for a particular filter application.
  • the filtration layers may include some layers having the channel pattern formed therein and some layers without a channel pattern formed therein, such as a planar sheet. These layers may be alternated when stacked to produce the filtration medium.
  • the filtration medium of the present invention is formed from non-woven material and may be particulate loaded.
  • a carbon loaded multi-layer BMF web formes the filtration layer producing a filtration medium capable of removing undesirable vapors and odors from a fluid.
  • the filtration medium of the present invention is highly versatile, allowing for numerous variations in channel configurations, layer configurations and stack configurations to produce a filter having the desired characteristics for a filter application.
  • the filtration medium of the present invention may be formed with an efficiency similar to a conventional filter, but with a much lower pressure drop, or may be formed with a pressure drop similar to a conventional filter but with a much higher efficiency.
  • Figure 1 is a plan view of one embodiment of a multiple channel pattern filter web of the present invention.
  • Figure 2 is a perspective view of a stacked filter formed from multiple layers of the filter web of Figure 1.
  • Figure 3 is a perspective view of an alternate stacked filter formed from multiple layers of an alternate filter web in accordance with the present invention.
  • Figure 4 is a perspective view of a stacked filter formed from multiple layers of a channel pattern filter web with planar web layers interposed between channel pattern web layers in accordance with the present invention.
  • Figure 5 is a perspective view of a stacked filter formed from multiple layers of another alternate filter web in accordance with the present invention.
  • Figure 6 is a cross-sectional view of a multi-layer blown microfiber strand in accordance with the present invention.
  • Figure 7 is a schematic illustration of a process for forming embossed filter webs in accordance with the present invention.
  • Figure 8 is a perspective view of a fan filter and fan combination in accordance with the present invention.
  • Figure 9 is a plot of vapor concentrations versus time for a number of different channel flow filter test samples having different channel configurations.
  • Figure 10 is a plot of adsorption efficiency versus time for the test samples shown in Figure 9.
  • Figure 11 is a plot of adsorption efficiency versus time for a number of different channel flow filter test samples having different filter configurations.
  • Figure 12 is a plot of adsorption efficiency versus time for a number of straight channel filter test samples wherein the channels were formed at different angles.
  • Figure 13 is a plot of vapor concentrations versus time for different channel flow filter configurations tested in an active filter application, wherein the solvent was evaporated from an oil based paint.
  • Figure 14 is a plot of vapor concentrations versus time for a channel flow filter configuration tested in another active filter application, wherein the solvent was evaporated from a commonly used sealant.
  • Figure 15 is a plot of vapor concentrations versus time for a channel flow filter configuration tested in the same active filter application as Figure 14, wherein the solvent was evaporated from latex paint.
  • Figure 16 is a schematic illustration a stacked channel flow filter formed as a sleeve lining a barrel in a passive filter application.
  • Figure 17 is a plot of vapor concentrations versus time tested in a barrel without a filter as solvent loaded material is added to the barrel.
  • Figure 18 is a plot of vapor concentrations versus time tested in a barrel lined with a stacked channel flow filter sleeve as solvent loaded material is added to the barrel.
  • Figure 19 is a bar graph of fractional efficiencies versus particle size ranges for various channel flow filter samples and a control sample tested for particle and odor adsorption.
  • Figure 20 is a plot of pressure drop versus face velocity for the samples of Figure 19.
  • a channel pattern filter web 100 of the present invention having a plurality of undulating channels 110 formed therein.
  • the channel pattern filter web 100 has a width 130 and a length 132 defined by the web formation process, the channel formation process, and/or other factors.
  • the channels 110 are regularly spaced across the web width 130.
  • each channel 111 is formed as a generally uniform undulating curve with a substantially sinusoidal shape.
  • the undulating shape of each channel 111 has both wavelength 112 and amplitude 114 characteristics associated with it as the channel 111 passes along the length 132 of the filter web 100.
  • the web 100 is shown with generally parallel channels having regular undulations, it is to be understood that the channels may be non-parallel and that the undulations may be irregular and vary from channel to channel, along the length of a single channel, and from web to web.
  • a stacked filter 200 also referred to as a channel flow filter, is shown that has improved efficiency and minimized pressure drop.
  • the filter web 100 is capable of adsorption of undesirable elements, such as vapors or odors, from a fluid.
  • the stacked filter 200 is formed from a plurality of stacked layers 205 of channel pattern filter web 100.
  • Each layer 205 of channel pattern filter web 100 includes two undulating edges 120, 121 one at each end of the channels 110 along the length 132 of filter layers 205.
  • the undulating edges 120, 121 are formed from the radiused cross-sections of the plurality of channels 110 formed across the filter web 100, as described above.
  • Each edge 120, 121 has both edge wavelength 122 and edge amplitude 124 characteristics associated with it, defining corresponding peaks 126 and valleys 128 that extend in a plane perpendicular to the plane of the filter layer 205.
  • regular undulations are shown, it is to be understood that the undulations may also be irregular and may vary across a web or from one layer to another layer within a multi-layer filter.
  • first face 210 of the stacked filter 200 includes a plurality of inlets 212 created by the peaks 126 of one layer 205 contacting the valleys 128 of an adjacent layer 205.
  • Second face 213 is located on the opposite side of the stacked filter 200 with corresponding outlets 215 created by the peaks 126 of one layer 205 contacting the valleys 128 of an adjacent layer 205.
  • the channels 110 may be formed with a different cross-section, such as a square, rectangular or triangular shape, so that the edges 120, 121 have a corresponding wave-form shape, such as a square wave, rectangular wave or triangular wave, respectively.
  • the stacked filter 200 is formed from the multiple layers 205 of channel pattern filter web 100 stacked together to a height 220.
  • the filter 200 has a width 222 equal to the width 130 of the filter web 100.
  • the filter 200 may have a width 222 less than the web width 130 if the web 100 is slit before filter formation, or greater than the web width 130 if the multiple webs 100 are positioned adjacent one another during filter formation.
  • the filter 200 may have a depth 223 equal to the length 132 of the channel pattern filter web 100.
  • the stacked filter 200 is skived to a predetermined depth 223 defined by the filter application for which the stacked filter 200 is to be used. In some situations, it may be desirable to use multiple stacked filters 200 placed adjacent one another to build up a desired filter assembly (not shown). Such filter assemblies will be described more below.
  • Each filter web 100 also has a web thickness 102 associated with it.
  • the web thickness 102 may range from about 0.05 millimeters to about 6 millimeters (about 0.002 to about 0.25 inches), but a range of about 0.8 millimeters to about 3 millimeters (about 0.03 to about 0.125 inches) may be more manageable. Since the thickness 102 of each web 100 may have an effect on the formation of the plurality of channels 110, the choice of web thickness 102 for a particular application may depend on the choice of channel size, amplitude and wave length, and thus may vary from the ranges given above. Although each layer 205 of the stacked filter 200 is shown with the same web thickness 102, it is to be understood that the web thickness 102 may vary from layer to layer, as well as across each individual filter layer 205.
  • the stacked filter 200 is placed so that the first face 210 is substantially perpendicular to the primary fluid flow, represented by arrows 230.
  • the fluid passes into the inlets 212 and travels along the plurality of undulating, tortuous and/or non-straight channels 110 as disruptive fluid pathways until it passes out of the stacked filter 200 at outlets 215, represented by arrows 232. It is believed that the majority of the adsorption achieved by the stacked filter 200 occurs by lateral diffusion during the fluid's passage along the channels 110, rather than by passage of the fluid through the channel pattern filter web layers 205.
  • the disruptive pathways formed by the tortuous shape of the channels 110 causes a perturbation of the fluid as it passes down the length of the channel, as determined by the depth 223 of the filter 200.
  • This perturbation of the fluid is an efficient way to introduce flow into the filter web 100, and thus increase the efficiency of the filter 200.
  • the disruptive pathways formed by the channels 110 also increases the turbulence and mixing of the fluid within the channels 110, providing a better concentration gradient across each channel 111, which also helps improve the efficiency of the filter 200.
  • a portion of the incoming fluid may travel a generally straight-line path down the center of some of the channels without contacting the filter web 100, such possibility is believed to be minimized by the perturbation and turbulence of the fluid created in the channels by the tortuous configuration of the channels.
  • the channels are shaped to preclude incoming fluid from traveling a straight path through the filter. It will be clear that the tortuousness of the channels can be increased or decreased depending upon the particular filtration application.
  • FIG. 3 an alternate embodiment of a channel flow or stacked filter 300 is shown formed from multiple layers 305 of channel pattern filter web 302.
  • the channel pattern filter web 302 includes a plurality of zig-zag shaped channels 310 formed from short linear channel segments 311 fluidly connected at angles to one another.
  • Each filter layer 305 has two undulating edges 320, 321 formed at each end of the plurality of channels 310 by the creation of the parallel zig-zag channels 310, similar to the undulating channels 110 described above.
  • a first face 330 includes a plurality of inlets 331 and a second face 335 formed on the opposite side of the stacked filter 300 includes a plurality of outlets 336.
  • the first face 330 is formed at an angle relative to the second face 335 creating non-parallel inlet and outlet faces.
  • the angled first face 330 can be formed during stacking of the layers 305 or the stacked filter 300 can be cut to the desired shape. It is to be understood that variations in face configurations, including but not limited to parallel, non-parallel, angled relative to filter layers, and perpendicular to filter layers, are within the scope of the present invention. Additionally, one or more of the faces can have two or more facets, or can be non-planar (e.g., sinusoidal).
  • the stacked filter 300 could be formed, molded or pleated to cause undulations of the filter layers 305 from the first face 330 toward the second face 335, thereby adding an additional dimension of perturbation in the filter 300.
  • the various configurations shown or described in the illustrated embodiments may all be combined to form numerous structures that are also within the scope of the present invention.
  • the fluid passes into the inlets 331 and travels along the plurality of zig-zag channels 310 until it exits the stacked filter 300 at the outlets 336.
  • the zig-zag shape of the channels 310 induces similar fluid flow as that of the undulating channels 110 due to the circuitous route the fluid travels in passing through the filter 300.
  • tortuous channels may form a regular or irregular pattern and may be symmetrical or asymmetrical across the major surface of the filter web. Additionally, the tortuous patterns on each layer may be the same, or may vary from layer-to-layer. It is to be understood that all such configurations are within the spirit and scope of the present invention.
  • FIG 4 another embodiment of a stacked filter 400 is shown formed from multiple layers 405 of channel pattern filter web 402 having undulating channels 410 and undulating edges 420, 421.
  • Any of the channel patterns disclosed herein may be used with the embodiment of Figure 4.
  • additional flat web layers 430 are interposed between the channel pattern layers 405.
  • the web layers 430 may be constructed of a filter medium, a porous reinforcing material such as a scrim or screen, or a non-porous material such as a film or paper.
  • each channel pattern layer 405 is bounded by a flat layer 430 producing a first face 425 of generally half-sized inlets 412 and a second face 426 formed on the opposite side of the stacked filter 400 of generally half-sized outlets 413 (as compared to the inlets 212 and outlets 215 of the embodiment shown in Figure 2).
  • the flat layer 430 there may be some fluid communication between adjacent channel pattern layers 405.
  • the size of each inlet 412 and outlet 413 is about half, the number of inlets 412 and outlets 413 may be about double (depending on the thickness of each web layer), thereby maintaining an equivalent fluid flow through stacked filter 400 and thus producing equivalent efficiency and pressure-drop results.
  • the channel pattern layers 405 may be aligned as desired, producing infinite variations in inlet and outlet patterning on the faces 425, 426 of the filter 400.
  • FIG 5 yet another embodiment of a stacked filter 350 in accordance with the present invention is shown formed from multiple layers 351 of channel pattern filter web 352.
  • a plurality of undulating channels 354 are formed across the filter web 352, but instead of the channels 354 proceeding only from a first face 360 to an opposite second face 362 as in the previously described embodiments, at least a portion of the plurality of channels 354 are angled.
  • a plurality of inlets 361 are formed on the first face 360 with a plurality of outlets 363 formed on the opposite second face 362, and additionally, a portion of the channels 354 produce a plurality of outlets 365 formed on a third face 364 that is at an angle relative to and adjacent to both the first and second faces 360, 362.
  • the perimeter of the stacked filter 350 can be square, rectangular, a parallelogram or a variety of regular and/or irregular shapes.
  • the primary fluid flow depicted by arrows 370, enters the inlets 361, the fluid proceeds along the plurality of channels 354 and a portion of the fluid exits the stacked filter 350 at outlets 363 (shown by arrow 372) and a portion exits the filter 350 at outlets 365 (shown by arrow 374).
  • outlets 363 shown by arrow 372
  • outlets 365 shown by arrow 374
  • channel flow filters with various inlet and outlet positions. It is to be understood that all such configurations are within the scope of the present invention.
  • the filter web material is a particulate loaded blown microfiber (BMF) web using a sorbent particulate material.
  • BMF particulate loaded blown microfiber
  • non-woven fibrous filter webs have been made from polypropylene using melt-blowing apparatus of the type described in Van A. Wente, "Superfine Thermoplastic Fibers", Industrial Engineering Chemistry , vol. 48, pp. 1342-1346 and in Report No. 4364 of the Naval Research Laboratories, published May 25, 1954, entitled “Manufacture of Super Fine Organic Fibers" by Van A. Wente et al. Melt-blown microfiber webs continue to be in widespread use in filtering particulate contaminants and vapor sorption.
  • Sorbent particulate material such as, but not limited to, activated carbon, silica, zeolite or alumina may be included in the web for sorbing organic vapors in filtration applications. Such particles may be present in amounts up to about 80 volume percent of the contents of the web.
  • particle-loaded webs are described, for example, in US-A-3,971,373 (Braun); 4,100,324 (Anderson) and 4,429,001 (Kolpin et al.).
  • FIG 6 a cross-section of a multi-layer fiber strand 500 of BMF is shown with a center core 510 of polymeric material, an upper layer 520 and a lower layer 530, both of adhesive.
  • Such multi-layer fiber strands 500 may be formed into a non-woven filter web (not shown) by known methods, as described, for example, in US-A-5,238,733 (Joseph et al.).
  • Particulate matter 540 subsequently applied to the web adheres to the adhesive layers 520, 530 of the individual fiber strands 500 providing a bond that results in high retention of the particulate matter 540 within the filter web, even when the web is handled or formed.
  • Particle loading of similar non-woven filter webs is described, for example, in WO-A-99/28542 (Springett et al.).
  • the filter web material was formed from a three-layer BMF including a core of polypropylene (75% of total weight) and top and bottom layers of propylene-hexene copolymer adhesive (25% of total weight).
  • the BMF web was loaded with Calgon 80 x 325 mesh carbon (80% by weight) resulting in an overall web basis weight of 250 grams/meter 2 .
  • Formation of the channels in the filter web may be achieved by many methods known to one skilled in the art.
  • a schematic illustration of an embossing apparatus 600 is shown into which a web 610, such as a particulate loaded filter web, is input.
  • Two mating embossing rollers 620, 625 impress the desired channel structure 612 into the web 610 to produce an embossed channel pattern web 615.
  • heating of the embossing rollers 620, 625 will cause the embossed channel structure 612 to be retained in the embossed web 615 without further support.
  • additional support structure may be required for the embossed web 615 to retain the embossed channel structure 612.
  • a support structure is provided by an extruder 630 producing a molten polymer fed through a die 632 to form strands 634 applied as a backing to the embossed web 615 at a nip 642 formed between a smooth roller 640 and the embossing roller 625.
  • a backing web 650 such as a spun-bond backing, may be applied at nip 642 on the side of the strands 634 opposite the embossed web 615.
  • the backing web 650 is then adhered to the embossed filter web 615 by the molten polymer strands 634. Once the embossed web 615 is formed, with or without additional support structure, the web 615 may be slit to a desired width and/or cut into desired length sheets to form the stackable layers of a stacked filter, as described above.
  • a pair of metal plates upon which a plurality of undulating parallel wires are attached, may be matingly positioned above and below a filter web.
  • the wires enmesh to produce the plurality of undulating channels and the undulating edge.
  • the wire diameter of the plate wires may be in the range of about 0.1 centimeters to about 1.0 centimeters (about 0.039 to about 0.39 inches), and was tested in the range of about 0.24 centimeters to about 0.41 centimeters (about 0.09 inches to about 0.16 inches).
  • the undulations of the wires produced a plurality of channels 110 having a wavelength 112 in the range of about 1.26 centimeters to about 2.0 centimeters (about 0.5 to about 0.79 inches), however a range of about 0.5 centimeters (about 0.20 inches) to about four times the depth 223 of the filter 200 is contemplated, but may vary.
  • the amplitude 114 of the channels 110 was tested in the range of about 0.4 centimeters to about 0.55 centimeters (about 0.16 to about 0.22 inches), however a range of about 0.1 centimeters to about 1.0 centimeters (about 0.039 to about 0.39 inches) is contemplated, but may vary.
  • the stacked filter of the present invention is useable both in passive fluid flow and active fluid flow applications.
  • FIG 8 an example of an active fluid flow application is shown.
  • a stacked filter 700 formed from channel pattern layers 710 of filter web 711 is shown built to a desirable size either as an individual stack or a combination of adjacent multiple stacks.
  • a frame 720 surrounds the stacked embossed layers 710 to hold the stacked configuration together during handling and use of the filter 700.
  • the filter 700 is used in conjunction with a standard fan 750 designed to either blow air through the filter 700 or draw air into the filter 700, whichever is most desirable for the specific application.
  • Such a filter 700 and fan 750 combination may be used, for example, in order to remove undesirable odors and vapors from an area, such as a freshly painted room, as a furnace filter, or other suitable application.
  • a channel flow barrel filter is formed from a plurality of stacked filter layers upon which a plurality of undulating channels were formed therein.
  • the depth of the filter is limited to a portion of the height of the barrel into which the channel flow filter is to be inserted to allow fluid flow around the bottom face of the barrel filter.
  • the side edges of the filter that is those edges along the length of the channels, are brought together to form a cylindrical sleeve configuration that may be placed around the inside perimeter of the barrel.
  • the stacked channel flow filter may be formed by wrapping a filter web, having the channel pattern formed therein, around a form to produce the multiple layers of the stacked filter.
  • the channels run from the top toward the bottom of the barrel.
  • solvent loaded materials such as cleaning rags
  • the barrel is closed
  • the solvent vapors are believed to flow up through the channels by convection.
  • the channel flow filter provides substantial adsorption of the solvent vapors present in the barrel, thereby substantially reducing the solvent vapor released from the barrel when the barrel is opened, as well as keeping concentrations of typical solvent vapors at safer levels during storage.
  • potential safety and health hazards are reduced to acceptable limits for materials loaded with typical cleaning solvents.
  • the stacked filter of the present invention uses multiple layers of filter material that are formed with a multi-dimensional non-straight or tortuous channel pattern to produce a high efficiency and low pressure drop filter, such as for vapor and odor removal from a fluid.
  • high efficiency is defined to be an efficiency preferably greater than 50 percent, and more preferably between about 50 percent and 70 percent, but may be even higher.
  • a low pressure drop is defined to be preferably in the range of about 0.6 to about 2.2 millimeters H 2 O, but it could be even less.
  • the use of the stacked channel flow filter medium of the present invention for the removal of vapor and odor
  • the use of such filter is also contemplated for the removal of particles from a fluid. It is believed that the structure of the stacked layers having a plurality of tortuous channels formed therein would provide enhanced particle removal, especially when combined with the use of charged filter web material.
  • the channel flow filters of the present invention would be useful for the enhanced removal of matter, such as aqueous and biological aerosols, particularly for use in home, medical and military applications.
  • channel flow filter of the present invention may also be used in combination with other filters, such as a non-woven face covering, a pleated filter or other suitable filter material, to form integral filtering units, such as a hybrid filter capable of efficient removal of both particles and vapors/odors for specific applications.
  • filters such as a non-woven face covering, a pleated filter or other suitable filter material
  • the stacked filter of the present invention uses multiple layers of filter material, at least one of which is formed to include a plurality of continuous, non-straight or tortuous channels formed across the surface of the layer, each having a radiused, or other shape, cross-section.
  • the formation of the channels produces edges at both ends of the channels that correspond in shape to the cross-section of each channel, producing a regular or irregular undulating shape.
  • the layers are positioned so as to produce a first face including a plurality of inlets and at least a second face including a plurality of outlets.
  • a fluid passes into the filter through the plurality of inlets, travels through corresponding disruptive fluid pathways formed by the undulating channels and then passes out of the filter through the outlets. It is believed that adsorption of the undesired elements in the fluid occurs primarily by lateral diffusion as the fluid passes along the channels, but also as the fluid passes into the filter layers due to perturbation of the fluid stream within the channels caused by the shape of the channels. In addition, the shape of the channels causes additional adsorption to occur due to turbulence and increased mixing of the fluid within the channels. Such additional adsorption helps produce a higher and longer term of efficiency for the stacked filter of the present invention than other adsorption filters.
  • the stacked structure and multiple channel formation of the stacked filter results in a low pressure drop in the fluid as it passes through the filter.
  • filters with an efficiency similar to a conventional filter, but a much lower pressure drop may be constructed for a particular application.
  • filters with a pressure drop similar to conventional filters, but with a much higher efficiency may also be constructed for a particular application.
  • the stacked filter of the present invention provides versatility in filter design for particular applications, in addition to the other benefits.
  • a test method used for determining pressure drop was to pass 170 liters/minute of gas, preferably cyclohexane or n-butane, through a stacked channel flow filter having a 6 centimeters by 6 centimeters square face and a depth of 5.1 centimeters with a 0.8 meter/second face velocity. The pressures before and after the gas passed through the filter were then recorded, and the difference between the two was determined.
  • gas preferably cyclohexane or n-butane
  • Embossing plates with the patterns listed below were made by mounting sinusoidally bent wire strips onto an aluminum plate. The spacing was such that the top and bottom plates nested together and produced a uniform channel pattern in a web embossed between them. Several of these wires were bent at a time between two plates that had machine bolts epoxied down in parallel, at spacings corresponding to the "wavelength" desired. Different gauge wires (“steel, aluminum and copper”) were used to produce different channel diameters. "Amplitude" of the wavy channel was a function of the bolt diameter and spacing on the bending plate, wire gauge, and force on the ram.
  • the embossing plates had the following dimensions: Pattern # Wavelength Amplitude Wire Diameter Descriptor 1 2 cm 0.55 cm 0.244 cm High amplitude steel 2 2 cm 0.40 cm 0.244 cm Low amplitude steel 3 1.26 cm 0.40 cm 0.3175 cm Low amplitude aluminum 4 2 cm 0.40 cm 0.406 cm Low amplitude copper
  • Carbon loaded web was made containing about 80% by weight Calgon 80 x 325 mesh carbon and about 20% by weight blown micro-fiber (about 8-12 micron effective fiber diameter).
  • the fiber strand had three layers: a center layer of polypropylene (about 75% of the total weight) and top and bottom layers of propylene-hexene copolymer adhesive (about 25% of the total weight).
  • the basis weight of the carbon loaded web was about 250 grams/square meter. (The procedure for making this web is described in Springett et al.)
  • Webs were pressed between the embossing plates for about 30 seconds at 70 degrees C in about a 30.5 centimeters x 30.5 centimeters (12 inch x 12 inch) hydraulic press at about 17,792 Newtons (about 4000 pounds). These embossed webs were cut by a ruling die into about 6 cm x 5.1 cm segments with the sinusoidal channels aligned perpendicular to the about 6 cm edge. Segments were stacked loosely, with channels aligned in parallel, to form a stack about 6 cm high. This stack was mounted in a cardboard frame to make a channel flow filter with about a 6 cm x 6 cm cross-section (channel openings at entrance and exit), and a sample thickness (in the flow direction) of about 5.1 cm. A bead of hot melt adhesive was applied around the perimeter of the filter to bind the layers to the frame and prevent bypass.
  • Channel flow samples were compared to an internal standard pleated control.
  • 40 x 140 mesh Kuraray coconut carbon was heat fused to a polyester scrim using powdered polyurethane as a binder.
  • a layer of Minnesota Mining and Manufacturing Company's (3M) Filtrete GSB 30 blown micro-fiber particle capture medium was fused to the carbon layer on the side opposite the scrim. This material was pleated to a depth of about 4.4 cm, with about a 1 cm pleat-to-pleat spacing and was cut about 6 cm wide.
  • a cardboard frame was glued around the sample to make about a 6 cm x 6 cm cross-section and about a 4.4 cm thick sample having approximately 9.3 grams carbon per sample. Flow was through the web, in contrast to flow parallel to the web in the channel flow filters.
  • n-Butane concentration (Miran IR detector) readings exiting the samples were converted to adsorption efficiencies ((challenge concentration - exit concentration) /- challenge concentration).
  • a plot 800 shows the exit concentrations in ppm (along axis 802) plotted as a function of time in minutes (along axis 804), for samples made from the four different sinusoidal patterns listed above.
  • Curve 814 was a pattern #1 having a pressure drop of about 2.26 millimeters H 2 O; curve 812 was a pattern #2 having a pressure drop of about 1.56 millimeters H 2 O; curve 810 was a pattern #3 having a pressure drop of about 1.51 millimeters H 2 O; curve 808 was a pattern #4 having a pressure drop of about 0.64 millimeters H 2 O; and curve 806 was the pleated control having a pressure drop of about 2.20 millimeters H 2 O.
  • a plot 820 shows the adsorption efficiencies (along axis 822) plotted as a function of time in minutes (along axis 824), also for samples made from the four different sinusoidal patterns listed above.
  • Curve 834 was a pattern #1 having a pressure drop of about 2.26 millimeters H 2 O; curve 832 was a pattern #2 having a pressure drop of about 1.56 millimeters H 2 O; curve 830 was a pattern #3 having a pressure drop of about 1.51 millimeters H 2 O; curve 828 was a pattern #4 having a pressure drop of about 0.64 millimeters H 2 O; and curve 826 was the pleated control having a pressure drop of about 2.30 millimeters H 2 O.
  • the channel flow structure appears to retain a higher efficiency for longer than the control. This is attributed to the fact that the samples contain more carbon than the control, and most likely expose it more to the gas stream (finely divided carbon primarily at the surface).
  • a plot 840 shows the adsorption efficiencies (along axis 842) plotted as a function of time in minutes (along axis 844) for various samples.
  • Curve 846 was a pattern #1 formed from about 640 grams/meter 2 base weight web with light compression having a pressure drop of about 2.45 millimeters H 2 O; curve 848 was a pattern #3 formed from about 640 grams/meter 2 base weight web with heavy compression having a pressure drop of about 1.88 millimeters H 2 O; curve 850 was a pattern #3 formed from about 320 grams/meter 2 base weight web with light compression having a pressure drop of about 1.11 millimeters H 2 O; curve 852 was a pattern #3 formed from about 640 grams/meter 2 base weight web with light compression having a pressure drop of about 1.92 millimeters H 2 O; and curve 854 was a pattern #4 formed from about 640 grams/meter 2 base weight web with light compression having a pressure drop of about 1.00 millimeters H 2 O.
  • a plot 860 shows the adsorption efficiencies (along axis 862) plotted as a function of time in minutes (along axis 864) for the various samples.
  • Curve 866 was an embossed angle of about 45 degrees having a pressure drop of about 2.25 millimeters H 2 O; curve 868 was an embossed angle of about 25 degrees having a pressure drop of about 1.27 millimeters H 2 O; curve 870 was an embossed angle of about 10 degrees having a pressure drop of about 1.03 millimeters H 2 O; and curve 872 was an embossed angle of 0 degrees having a pressure drop of about 0.82 millimeters H 2 O.
  • Adsorption efficiencies and pressure drops were compared for edge filters with sinusoidal channels and with straight channels of the same diameter.
  • One set of filters was made from stacked layers embossed with the high amplitude sinusoidal pattern #1, as listed above in Example 1 (embossing plates: about 0.244 centimeters diameter (steel) wires, amplitude: about 0.55 cm; and wavelength: about 2 cm; row spacing: about 0.80 centimeters (plates nest)).
  • a second set was made from stacked layers embossed with straight channels having the same diameter and channel to channel spacing.
  • each layer was a composite of embossed carbon loaded web (about 300 grams/meter 2 , about 80% carbon loading, composition described earlier) bonded to a flat sheet of paper. This was done to get a pure channel pattern and prevent nesting of the layers. The web was left in the plate after embossing, and a flat sheet of computer paper was bonded to it with Minnesota Mining and Manufacturing Company Spray Bond hot melt adhesive (#6111) before removing.
  • embossed carbon loaded web about 300 grams/meter 2 , about 80% carbon loading, composition described earlier
  • Layers of this corrugate were stacked about 18 layers deep (about 5.1 centimeters high), with Spray Bond between layers, and cross-cut with a serrated edge band saw to produce filters about 4.8 centimeters thick (flow direction), about 15 centimeters long and about 5.1 centimeters high (59-62 g combined weight, or approximately about 40 grams carbon each). Filters were weighed, and mounted in cardboard frames.
  • Pressure drop across the sample was monitored with a digital manometer (Dwyer Series 475, Dwyer Instruments, Michigan City, Indiana) through separate sample ports upstream and downstream from the filter.
  • Flow velocities were measured at the opening to the box, using an air velocity meter (TS1 Model 8330 Velocicheck, TSI Incorporated, St. Paul, MN) and converted to face velocities at the sample.
  • TS1 Model 8330 Velocicheck TSI Incorporated, St. Paul, MN
  • concentration readings were taken for a few minutes on the entrance side of the filter, until a reasonably steady state was reached, and then three or four readings were averaged to determine the challenge or entering concentration.
  • the sampling tube to the detector was then switched to monitor concentrations coming out of the filter. Since filter efficiency decreases as gas is absorbed, both concentration and time after sample placement were recorded.
  • the detector was set to draw gas samples at 1 minute intervals from the flowing stream; the sampling tube was switched during the off cycle.
  • a channel flow medium comprising a carbon loaded web containing about 80% by weight Calgon 80 x 325 mesh carbon and about 20% by weight blown microfiber (BMF) (about 8-12 micrometers effective fiber diameter).
  • the fiber strand of the BMF had three layers: a center layer of polypropylene (about 75% of the total weight) and top and bottom layers of propylene-hexene copolymer adhesive (about 25% of the total weight).
  • the web had about 250 grams/meter 2 overall basis weight.
  • Sinusoidally shaped channels were embossed into sheets of the loaded web by hot pressing between about 24.1 centimeters by 22.9 centimeters (9.5 inches x 9 inches) patterned plates with a force of approximately 17,792 Newtons (about 4000 pounds), a temperature of about 70 degrees C and a dwell time of about 30 seconds. Layers were then stacked with channels running in the same direction. Strands of hot melt adhesive Minnesota Mining and Manufacturing Company Spray-Bond Adhesive 6111) were laid down between the layers with a Minnesota Mining and Manufacturing Company Spray Bond Applicator to produce a sponge-like stack. Layers were stacked until the pile was about 5.1 centimeters (2 inches) high.
  • the stack was then cross-cut into about 5.1 centimeters (2 inches) thick filters, cutting about 90 degrees to the channel direction with a serrated edge band saw. (The face of these filters resembles Figure 2.)
  • the filters had a cross-section of approximately 5.1 centimeters by 22.9 centimeters (2 inches x 9 inches), were flexible and self-supporting, and resembled an open cell sponge.
  • Solvent concentrations were monitored with a Bruel and Kjer photo-acoustic IR multi-gas detector, sampling the room air through about 3.18 millimeters diameter (1/8 inch) tubes running through the wall.
  • the [C-H] stretch frequency was monitored using a hexane-based calibration for mineral spirits, developed during experiments in the one cubic meter box.
  • the standard routine was to apply about 3.78 liters (one gallon) of paint by roller to nine 1.2 meters by 2.4 meters (4 feet x 8 feet) plywood panels covered on both sides with paper, vent during painting (about 15 minutes), and then vent the room for a total of about 3 hours (including the time of painting).
  • the test room was vented with the exhaust fan mounted in the window, the door partially open, and heater and circulation fan on. Concentrations typically reached several hundred PPM during venting and then decreased. Once the concentration had reduced to about 35 to 40 PPM, the filter unit was placed, the room was sealed, the circulation fan and heater were left on, and the concentration was monitored for several hours. During venting, the temperature was between about 9 and 11 degrees C, and stayed there throughout the remainder of the test.
  • a plot 880 shows the results of the five experiments with the concentrations in ppm (along axis 882) plotted against time in minutes (along axis 884):
  • Poster board panels were painted with a total of about 40 grams of the KILZ (approximately 12 grams of solvent) outside of the box, and then transferred immediately to the box.
  • the box was aerated for about 12 minutes by drawing air through the two about 8.9 centimeter (3 1/2 inch) blast gate vents. Solvent concentrations in the box were monitored with the B&K detector.
  • a plot 900 shows the results of the KILZ test with VOC concentrations in ppm (along axis 902), plotted against time in minutes (along axis 904).
  • First a baseline was run with no filter unit in the box, Curve 906. Then the process was repeated, with placement of the recirculating unit at the end of the about 12 minute aeration period, Curve 908. The filter did a very good job of reducing and maintaining the VOC level in the box.
  • a plot 910 shows the results of the latex test with VOC concentrations in ppm (along axis 912), plotted against time in minutes (along axis 914).
  • a baseline was run (Curve 916). Then the test was repeated with the re-circulating filter unit in the box for the latex covered boards (Curve 918).
  • the channel flow filter was also effective in reducing and maintaining the concentration of VOC's generated by the water-based paint.
  • a passive channel flow filter 970 is used in a barrel 960 to remove vapors from solvent loaded rags 966 placed in the barrel 960 for storage.
  • the barrel 960 (or drum) is typically found in maintenance shops for the storage of solvent filled cleaning rags 966, and is provided with a lid 962 connected at a hinge 964 that can be hermetically sealed between openings.
  • a standard barrel 960 about 81.3 centimeters (about 32 inches) high, is modified to include sample ports formed from bulkhead connectors and copper tubing built into the wall.
  • a B&K photo-acoustic IR detector is used to sample the internal concentration of the barrel through these ports.
  • a stacked channel flow filter sleeve 970 is formed from five layers 971 of carbon loaded adhesive-BMF filter web having a plurality of channels 972 formed therein. The filter sleeve 970 is formed from continuous formed filter web attached to a backing scrim, which is then rolled up around a barrel-shaped form until the five layers 971 are achieved; each of the layers are adhered together by spray bond adhesive.
  • the filter sleeve 970 has an outer diameter slightly less than the inner diameter of the barrel so as to line the inside of the barrel 960.
  • the filter sleeve web material is chosen such that the resulting overall amount of carbon within the filter sleeve is about 2000 grams of carbon.
  • the filter sleeve 970 is about 61 centimeters (about 24 inches) deep, such that the tortuous continuous channels 972 formed in the filter web layers 971 are about 61 centimeters (about 24 inches) long.
  • the filter sleeve 970 is mounted in the barrel 960 near the top of the barrel using hooks (not shown) mounted around the barrel's inner wall about 61 centimeters (about 24 inches) down from the top of the barrel.
  • the filter sleeve 970 is set to rest within these hooks.
  • the first face 973 of the channel flow filter sleeve 970 is near the top of the barrel 960 and is substantially perpendicular to the wall 961 of the barrel 960.
  • the second face 974 of the filter sleeve is positioned substantially perpendicular to the wall 961 of the barrel 960 at about 61 centimeters (about 24 inches) from the top of the barrel 960.
  • a barrel test on the concentration variation of solvent within the barrel with and without the channel flow filter sleeve is run by dropping rags containing a fixed amount of solvent into the barrel and measuring the concentration levels using the B&K detector.
  • solvent dosed rags containing 15 cubic centimeters (cc) per 3 rags are dropped into an empty unlined barrel.
  • a plot 920 shows the solvent concentration in ppm (along axis 922) plotted against time in minutes (along axis 924).
  • 3 rags with about 15 cm 3 of solvent are added to the barrel for a total volume of about 60 cc at data point 928.
  • At both data points 929 and 930 about 30 cm 3 of solvent are added to the barrel, and at data point 931 an additional about 60 cc of solvent is added to the barrel.
  • a total of about 180 cm 3 of solvent is added to the barrel.
  • the concentration levels will rise quickly to unsafe concentrations, such that at about 120 cm 3 , in about 150 minutes, the solvent concentration is in the range of about 12,500 ppm which would cause the detector to stop reading. Since the lower explosive limit (LEL) for toluene is 12,000 ppm, this is potentially an unsafe situation.
  • LEL lower explosive limit
  • a plot 940 shows the solvent concentration in ppm (along axis 942) plotted against time in minutes (along axis 944).
  • ppm long axis 942
  • time in minutes along axis 944.
  • about 15 cm 3 of solvent are added on rags into the barrel.
  • about 30 cm 3 of solvent are added on rags into the barrel.
  • about 60 cm 3 of solvent are added on rags into the barrel, and at data points 953 and 954, about 100 cm 3 of solvent are added on rags into the barrel.
  • the total volume of solvent in the barrel is about 440 cm 3 on about 42 rags.
  • the concentrations of the solvent within the barrel spike as rags are added to the barrel, but then ramp downward to maintain lower levels of solvent vapor in the barrel, in the range of less than about 500 ppm. This lower level is maintained even with the higher volume of solvent in the barrel.
  • Example 3 An about 2.5 cm (1 inch) thick channel flow filter with about a 51 cm x 51 cm (about 20 inch x 20 inch) face was constructed by the methods described in Example 3, and mounted in a cardboard frame.
  • a flat layer of 3M FILTRETE BMF particle capture media (3M GCB 30) was mounted to one side of the channel flow filter, and a layer of a polypropylene (Claf) scrim to the opposite side (sample #GCB30-CF-C).
  • a second sample was constructed with a layer of particle capture media (3M GCB 30) mounted to both sides of the channel flow filter (Sample #GCB30-CF-GCB30).
  • a bar graph 960 shows the fractional efficiency in percent (along axis 961) plotted against particle size ranges in microns (along axis 962).
  • Bars 963 show the fractional efficiency variations for differing particle size ranges for sample GCB30-CF-C.
  • Bars 964 show the fractional efficiency variations for differing particle size ranges for sample C-CF-GCB30, which is the same as sample GCB30-CF-C only with the exit and entrance sides reversed.
  • Bars 965 show the fractional efficiency variations for differing particle size ranges for the control sample ARF.
  • Bars 966 show the fractional efficiency variations for differing particle size ranges for sample GCB30-CF-GCB30.
  • a plot 970 shows the pressure drop in inches of H 2 O (along axis 971) plotted against face velocity in feet/minute (along axis 972) for the above samples.
  • Curve 973 shows the test results for sample GCB30-CF-GCB30;
  • curve 974 shows the test results for sample C-CF-GCB30;
  • curve 975 shows the test results for the control ARF.
  • a similar filter with an about 2.2 cm (0.875 inch) thick channel flow layer and a flat layer of FILTRETE GCB 30 was tested in a forced air equipped house of about 223 square meters (2400 square feet).
  • the house was dosed with low levels of cyclo-hexane by mildly heating a metal beaker of cyclo-hexane near an intake vent. Concentration of the cyclo-hexane was monitored in another location in the house, using the B&K detector. Baseline decays of the concentration were established before and after placement of the filter in the filter slot at the intake to the furnace. With the filter in place in the recirculation unit, decay in concentration of cyclo-hexane was significantly more rapid than during either of the two baseline periods. It required about 20 minutes to reduce levels from about 33 to about 27 ppm without the filter, and about 9 minutes to reduce levels from about 33 to about 27 ppm with the filter. Thus, this combination filter also was capable of absorbing potential odors from a home.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
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  • Separation Of Gases By Adsorption (AREA)
EP00950670A 1999-08-13 2000-07-26 Channel flow filter Expired - Lifetime EP1202790B1 (en)

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US09/374,148 US6273938B1 (en) 1999-08-13 1999-08-13 Channel flow filter
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PCT/US2000/020237 WO2001012295A1 (en) 1999-08-13 2000-07-26 Channel flow filter

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